电弧摆动对管堆焊温度场及微观组织的影响  

Effect of Arc Swing on the Temperature Field and Microstructure of Pipe Overlay Weld

作　　者：叶义海[1] 徐少峰 柏忠炼 李诗易 林腾飞 YE Yihai;XU Shaofeng;BAI Zhonglian;LI Shiyi;LIN Tengfei(Nuclear Power Institute of China,Chengdu 610213,China)

机构地区：[1]中国核动力研究设计院,四川成都610213

出　　处：《电焊机》2024年第4期55-62,共8页Electric Welding Machine

摘　　要：为掌握电弧摆动对管堆焊过程的影响,采用焊接仿真与工艺试验两种方式对比电弧摆动和不摆动操作的温度场、残余应力及焊接变形并进行了金相分析。首先,基于有限元分析软件Abaqus,采用热弹塑性有限元法建立焊接过程有限元模型,对摆动焊与常规无摆动焊的温度场进行模拟,并分析熔池的演变过程及温度场分布、热循环曲线等特征。结果表明:摆动焊温度分布云图呈拉长状态,其熔池形状相较于不摆动焊的椭圆形更接近波浪形,摆动焊的温度场更均匀、残余应力更低,可提高焊缝等轴晶比例,细化晶粒,改善焊缝显微硬度。其次,通过金相分析对比了摆动焊与不摆动焊的显微组织,结果表明,摆动焊能够提高焊缝等轴晶的比例和焊缝显微硬度。To know well the impact of arc swing on the process of pipe surfacing,the effects of swing operation on the temperature field and microstructure of the surfacing process were compared through welding simulation and process teste.First of all,based on the finite element analysis software Abaqus,the finite element model of the welding process is established by the thermal-elastoplastic finite element method,and the temperature field of swing welding and conventional non swing welding is simulated,and the evolution process of the molten pool,the temperature field distribution,thermal cycle curve and other characteristics are analyzed.the results show that the temperature distribution cloud map of swing welding is elongated,and the shape of the weld pool is closer to the wave shape than the ellipse of non swing welding,the peak temperature is also lower than that of non swing welding.Secondly,the microstructure of swing welding and non swing welding was compared through metallographic analysis.The results showed that during swing welding,only a small amount of columnar crystal structure was observed in the backing weld.

关 键 词：堆焊 摆动焊 数值模拟 温度场 微观组织。 

分 类 号：TG455[金属学及工艺—焊接]